I have heard one of the most absurd things/rumors in regard of an animated show by a fan of SU recently. Get this: Supposedly, the reason as of why season 2 was rather short and NOW s3 starts and tries to be as much of actual plot as possible is as followed: CN axed episodes.
I tried to find confirmation myself (so far nothing unfortunately) but the guy I know stated that supposedly there were more episodes of SU already made than aired. Only these episodes would have been again more filler than something related to the actual plot. But now CN has enough of filler cause of fans and wants the plot going on. As a result, Sugar and company axed most episodes and are now busy getting the plotlines going, cause they are afraid the fans will leave sooner than later.